Days? Heck, if you're really lucky, it'll be fun for months... (ducks and runs)
They really aren't bad machines to work on - the worst possible issue I can imagine is a leaky tub or a totally messed-up speed changer. You'll likely run into some issues with the water valve, but if you are careful, you should be able to clean it and preserve all three wash temperatures!
I've got LOTS of pictures of the various stages of work on an earlier L5 and my current CLB-6, so if you ever might need one, please let me know!